Abstract: According to the present apparatus work pieces such as railroad wheels are power clamped on a cone shaped inwardly facing side. In a first clamping step clamping areas are impressed into the side or surface of the work piece said clamping areas having a suitable inclination. In a second clamping step the actual power clamping is performed at these clamping areas. For this purpose a plurality of radially moving clamping jaws are arranged to carry at least one clamping tooth. Each clamping tooth in turn is adjustable in its position in an axial direction along its respective radially moveable clamping jaw.

Abstract: The present method relates to finish boring of prebored bores in a work piece such that an operative fit with a counterpart or further work piece is achieved. The finishing of the bore may be accomplished independently of the instantaneous temperature of the work piece and of the counterpart by operating a tool carriage, for example, on a lathe, with a stepping motor controlled by a correction value computer which generates a control signal in response to a temperature difference between the work piece temperature and a reference temperature. The reference temperature may be that of the further work piece.

Abstract: A method for controlling proper clamping of a workpiece in a clamping device, the clamping jaws of which are moved to a clamping position by movement of a piston of hydraulically operated cylinder-and-piston means in a clamping direction, in which a control signal is produced indicating proper clamping of the workpiece when sensing means cooperating with the piston indicate that the latter, during its movement in clamping direction, has reached at least a first position but not reached a second position spaced in clamping direction from the first position, while at the same time a predetermined pressure acting in clamping direction on the piston is indicated.

Abstract: A vertical boring and turning mill has a base and a rotatable table supported on the base as well as an upright frame carrying a horizontal cross beam, which in turn carries a plurality of horizontally adjustable slides or carriages. Each slide or carriage supports a vertically adjustable tool slide or support. The vertical carriages of at least two tool supports are coupled to each other in such a manner that at least two supports have a common drive and control mechanism, whereby substantial savings are achieved.